Improvement in sickle-grinders



I .l. M. CONNEL;

Improvement in Sickle-Grinders. No. 129,395. Patented July 16, 1872..

Immmmn lmmumnmumm .dttarneys.

UNITED STATES PATENT OFFICE.

JAMES M. OONNEL, OF NEWARK, OHIO.

IMPROVEMENT IN SICKLE-GRINDERS.

Specification forming part of Letters Patent No. 129,395, dated July 16, 1872.

To all whom it may concern:

Be it known that I, JAMES M. CoNNEL, of Newark, in the county of Licking and in the State of Ohio, have invented certain new and useful Improvements in Apparatus for Grinding Knives for Reapers and Mowers; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon makin g a part of this specification.

The nature of my invention consists in the construction and arrangement of a machine for grinding knives for reapers and mowers, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawing, in which- Figure 1 is a perspective view of my entire machine. Fig. 2 is an enlarged longitudinal section of the grinding-roller. Fig. 3 shows a modification of the grinding-roller. Fig. 4 is an enlarged side view of the upper end of the support or standard. Fig. 5 is a perspective view of the bolt connecting the drivingwheel with the grinding-roller pitman. Fig. 6 is a view of a washer used on said bolt; and Fig. 7 represents the upper end of the grindin g-roller pitman.

A represents a stand or table of any suitable dimensions provided, a suitable distance from one edge and parallel with the same, with a square groove, a, in which the knife-bar is to slide to bring the knives section by section in position to be ground. Between the groove a and the edge of the table is a series of pyramidal recesses, I), having their apexes a short distance from the groove, and their bases in the edge of the table. The spaces d between these recesses form seats, upon which the knifesections are to rest while being ground. At a suitable distance from the other side of the groove a is firmly secured a standard, B, the upper end of which is curved forward and provided with a slot, 8. O is the driving-wheel, grooved circumferentially, as shown, and provided with a handle or crank, E, for turning the same. Through the center of this wheel passes a bolt, D, which also passes through the slot e of the standard B. This bolt has a shoulder, f, around its circumference just at such a distance from the head that when the bolt is inserted through the wheel and slotted standard, and a washer, G, put on the other end and tightened, said washer will bear against the shoulder f, and, although close to the side of the standard, will not bind on the same. Thus the friction is absolutely reduced to the smallest possible amount, and the bolt easily made to traverse the entire length of the slot 6. The outer surface of the washerG is serrated, as represented in Fig. 6. H represents the pitman, which carries the grindingroller or cylinder at its outer end. The inner end of the pitman has a longitudinal slot, h, as shown in Fig. 7, and the inner side of the pitman at this end is serrated to correspond with the serrations on the washer, so that when the pitman is placed on the end of the bolt D, and a nut, k, screwed on said end and tightened up, the serrationswill engage with each other and prevent the pitman from slipping up or down. At a suitable point on the pitman H is secured an L-shaped handle, I, or

said handle may be cast with the pitman in one piece. One arm of this handle extends at right angles from the pitman, while the other arm runs parallel with and a suitable distance from the same. its outer end being on a line with the outer end of the pitman, so that a shaft, K, may pass through and have its bear ings in said end. Upon the end of the shaft K which goes through the end of the pitman is formed or attached a pulley, m, connected by a rope or belt, a, with the circumferentiallygrooved driving-wheel C, so that when said wheel is revolved it will rotate said shaft with the grinding-roller. The object of the slot h in the upper end of the pitman H is that if the rope or belt a should get too tight by shrinkage, or too loose by wear, or for any other cause, then, by unscrewing the nut is, or rather loosening the same, the pitman H may be drawn up or extended, as the case may be, so as to give the belt the proper tension, and then the nut tightened up again to hold the pitman at the point desired. Upon the shaft K, between the pitman and the handle, is placed the grinding roller or cylinder, which is made in two equal conical parts, J J, slipped onto the shaft against a shoulder, t, on the same, and held by'a nut, screwed on the other end. The shoulder i on the shaft is made immediately on the inside of the pitman, while the nut 19 is located on the inside of the handle, as more fully shown in Fig. 2. The parts J J are made hollow, thus making a saving in material, and, as above mentioned, they are made in conical form. At the apex of each cone the inner side is made straight, so as to form a bearing for the roller on the shaft; this interior straight portion may be of any desired length, so as to form the necessary bearing, but its needs only be comparatively short, say about equal to the thickness of the metal in the roller. The bevel or inclination of the two parts J J is made to correspond with the bevels of the edges of the knives; and the difference in the radius of the larger end and that of the smaller end of each part J is equal to the difference in height of the inner and outer ends of the slot ein the standard B. This slot may be curved, as shown, or straight, if desired, only so that the relative height of its ends shall be as above mentioned. The object of this is that while the machine is in operation, and the bolt D with the drivingwheel and pit-man is moved from one end of the slot to the other, the pitman will maintain nearly the same angle, and not have to be oscillated or moved up and down in grinding from the heel to the point of the knife. The operator turns the wheel with'his right hand, and with his left hand has hold on the handle I, and hence can readily move it back and forth in the slot on the standard, as may be necessary.

It will be seen that my grinding-roller grinds the opposite edges of two adjoining knives at one time, or by reversing the position of the two parts J J, it will grind the two edges of one knife at the same time.

The grindin g-rollers bein g made in two parts, one or more washers, 2?, may be inserted in the center, so as to accomodate it to various kinds of reapers and mowers, the distances between the centers of the knives in all machines not stantially as and for the purposes herein setv forth.

2. The combination of the stationary standard B with slot 0, the driving-wheel 0, bolt D with shoulder f, serrated washer G. serrated pitman H with slot h, and the nut is, all substantially as and for the purposes herein set forth.

3. A grinding-roller made in two parts, each part in conical form and placed upon one shaft, substantially as herein set forth.

4. A grinding-roller made in two equal parts, each part being a hollow cone, substantially as herein set forth.

5. In combination with a centrally bisected grinding-roller, each part being in conical form, I claim one or more washers, t, inserted in the center between the two parts, substantially as and for the purposes herein set forth.

6. The combination of the shaftK with shoulder i, bisected grinding-roller J, and nut 19, substantially as and for the purposes herein set forth.

7. The arrangement of the pitman H and handle I to form the bearings for the shaft upon which the grinding-roller is placed, as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this 14th day of May, 1872.

J. M. (JONNEL.

Witnesses:

' O. L. EVERT,

A. N. MARR. 

